From 1956. Same long hour hand than the one of the 6150 I posted some days ago, with an extra: The Red " Depth " Line. These early Explorers are such a charm! Credit: Jacek. Best, Nicolas ...
Interesting how deep a history one buys into when getting a Rolex. Maybe becuase they have kept to a few models with many variation, instead of many models with few variations 🤷♂️